When it comes to achieving a solid night's sleep, a cool room is a must. But it turns out that warming the body, as counterintuitive as that sounds, is equally important.

According to renowned sleep scientist and author Jessa Gamble, a huge component of our circadian rhythm throughout the day is temperature regulation. Before we are ready to head to bed, the body's temperature naturally drops, which activates other automatic reactions that prepare us for sleep. When this shift happens,...